Indicates whether the AVM provides access to ABL and .NET stack trace information, where applicable, when an error occurs during a session. Its primary use is for error alert boxes, so you can determine where an error occurred in your code.

Data type: LOGICAL

Access: Readable/Writeable

Applies to: SESSION system handle

When an unhandled ABL error or .NET Exception occurs in an interactive session for any ABL client, the AVM displays an Error message box. When DEBUG-ALERT is TRUE, the message box also includes a Help button, which when pressed, produces a Stack Trace dialog box containing ABL and .NET stack trace information. If the error was generated by throwing an error object from the ABL code and the Error Stack (-errorstack) startup parameter is used, or the ERROR-STACK-TRACE attribute on the SESSION system handle is set to TRUE, then the stack trace also includes the contents of the CallStack property for the unhandled error. The ABL and .NET stack traces are also written to the client log when the Client Logging (-clientlog) startup parameter is specified. The top of the stack (most recent call) is displayed at the top of the trace listing.

You can also set DEBUG-ALERT to TRUE using the Debug Alert (-debugalert) startup parameter. For more information see Startup Command and Parameter Reference.

For more information about debugging from an alert dialog box, see Troubleshoot ABL Applications.